package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;

public class CollectionDemo {
    public static void main(String[] args) {

        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p=new Point(1,2);


        boolean contains=c.contains(p);
        System.out.println(contains);

        c.remove(p);
        System.out.println(c);
        c.remove(p);
        System.out.println(c);


      Collection cc=new ArrayList();
      Point pp=new Point(1,2);
      cc.add(pp);
        System.out.println(cc);
        pp.setX(100);
        System.out.println(cc);



























        /*
        Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        System.out.println(c);


        System.out.println("集合的元素个数为:"+c.size());
        System.out.println("是否为空集"+c.isEmpty());

        c.clear();
        System.out.println(c);
        System.out.println("集合元素的个数为:"+c.size());
        System.out.println("是否为空集"+c.isEmpty());

         */




    }
}
